In a simple random sampling, the sample mean is an unbiased estimate of the population mean.

在简单随机抽样中, 样本均值是总体均值的无偏估计.

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Two kinds of estimators were compared under PPS sampling and simple random sampling with replacement.

本文在PPS抽样方案和有效回简单随机抽样方案的情形下构造了这两种估计并精确比较了它们的优劣.

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The generalization of post stratification from the simple random sampling to complex design is discussed.

此外,我们探讨复杂抽样下,该估计值的推广.

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